Replacement point for rebuilding dragline bucket teeth



April 27, 1943. MOORE 2,317,932

REPLACEMENT POINT FOR REBUILDING DRAGLINE BUCKET VTEETH Filed June 21, 1941 'JLE' 74 7 75% Z FIE E INVENTOR. y W Moor-e Patented Apr. 27, 1943 REPLACEMENT POINT FOR REBUILDING DRAGLINE BUCKET TEETH Leroy M. Moore, Folsom, Calif.

Application June 21, 1941, Serial No. 399,077

2 Claims.

This invention relates to an improvement in rebuilding worn excavator teeth such as are used on dragline buckets, crowd shovels, or on any earth working equipment using teeth.

While it has previously been suggested that excavator teeth be repointed by welding a new point onto the worn end, I have observed that this practice is not particularly satisfactory for several reasons. For example, the excavator teeth wear away not only on the points but on the face advanced in the cutting of the earth. If such a worn tooth be repointed, it will not present the same cross-section and cutting contour to the earth as it did originally. Consequently, as a cutting tool, it will not be as eifective-nor as strong.

In accordance with the present invention the worn tooth is not only repointed but is reshaped as well, so that the cutting edge is provided in the proper relation to the cutting face, which face is also reshaped and reformed. This is achieved by a very simple operation.

It is in general the broad object of this invention to provide a novel and improved structure for repointing and refacing a worn earth cutting tooth.

.A preferred means for practice of the present invention is shown in the accompanying draw ing in which Figure l is a bottom view of the renewal tooth.

Figure 2 is a cross section taken along the line 2-2 of Figure 1, while Figure 3 is a side elevation of the renewal tooth.

Referring to the drawing, I have indicated a worn dragline bucket tooth or other excavator tooth at 4. The forward or point portion of this tooth wears away, usually leaving a transversely rounded curved outer edge indicated at 5. The forward or cutting face 6 of the tooth also wears away generally along a line as indicated at 1. With a tooth in this condition, it is necessary that it either be reconstructed or discarded. In accordance with this invention, I provide for repointing and refacing of the tooth by welding a suitable renewal tooth to the worn tooth.

As appears in Figure 2 I have shown associated with the worn tooth 4 a renewal tooth 8 having a certain presently described configuration and made of a suitable metal. At its forward end, the renewal tooth has a cutting face 9 from which tooth faces II and I2 taper rearwardly and outwardly to provide a thickened mid-section. Face I2 is continued by a substantially flat front cutting face l4.

As appears in Figure 1, rear face II, which slopes outwardly toward each side of the renewal tooth, terminates abruptly to provide transversely curved wall l6 sloping down to rearward by tapering portion IT. The radius of curvature of the wall I6 is such that the wall fits snugly against the outer rounded worn end portion of tooth 4.

The width of portion I1 is usually less than the width of the front portion of the worn tooth. The renewal tooth is joined to the Worn tooth by welding along the sides of portion l1 and between the wall [6 and the tooth. While I have shown the renewal tooth fitting snugly against the worn tooth, in practice the two will be separated slightly, particularly along wall l6 and along end l8. These spaces and the edges of portions I! are filled by welding. For convenience, the letter W has been applied to indicate the welding or surfaces to be welded in Figures 1 and 2.

I claim:

1. A replacement facing point for a worn ground cutting tooth comprising a metal plate having a cutting face along the forward edge thereof, said plate having a substantially fiat face on one side thereof and on the other side tapering rearwardly from said edge to provide a thickened mid-section in said plate, said thickened mid-section terminating abruptly to provide an arcuate wall extending transversely of said other side of said plate, said other side including a portion tapering rearwardly from the base of said wall, to a thickness materially less than the thick ness of said wall.

2. A replacement facing point as in claim 1 wherein the sides of said plate are relieved in those portions of the plate lying to the rear of the mid-section wall. 

